linux-kernel - [PATCH 0/2] dma-debug: prevent early callers from crashing

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Message-Id: <1415939462-28174-1-git-send-email-f.fainelli@gmail.com>
Date:	Thu, 13 Nov 2014 20:31:00 -0800
From:	Florian Fainelli <f.fainelli@...il.com>
To:	linux-kernel@...r.kernel.org
Cc:	dan.j.williams@...el.com, akpm@...ux-foundation.org,
	jkosina@...e.cz, horia.geanta@...escale.com,
	computersforpeace@...il.com,
	Florian Fainelli <f.fainelli@...il.com>
Subject: [PATCH 0/2] dma-debug: prevent early callers from crashing

Hi Dan,

This patch series addresses a problem seen on the brcmstb ARM platform where
dma_debug_init is called by the ARM kernel at fs_initcall time, while some of
our callers using the DMA-API were running at arch_initcall time.

Unless CONFIG_DMA_API_DEBUG is set, this is completely silent.

First patch introduces a helper function to check whether a DMA-API debug
implementation is allowed to proceed, while the second patch introduces an
initialization flag and uses the helper. A complete writeup of how and why this
crashes is provided in patch 2.

Thank you!

Florian Fainelli (2):
  dma-debug: introduce dma_debug_disabled
  dma-debug: prevent early callers from crashing

 lib/dma-debug.c | 43 ++++++++++++++++++++++++++++---------------
 1 file changed, 28 insertions(+), 15 deletions(-)

-- 
1.9.1

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